1 files changed, 65 insertions, 0 deletions
diff --git a/src/3rdparty/autotrace/vector.h b/src/3rdparty/autotrace/vector.h
new file mode 100644
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+++ b/src/3rdparty/autotrace/vector.h
@@ -0,0 +1,65 @@
+/* vector.h: operations on vectors and points. */
+
+#ifndef VECTOR_H
+#define VECTOR_H
+
+#include "types.h"
+#include "exception.h"
+
+/* Our vectors are represented as displacements along the x and y axes.  */
+
+typedef struct {
+  gfloat dx, dy, dz;
+} vector_type;
+
+/* Consider a point as a vector from the origin.  */
+extern vector_type make_vector(const at_real_coord);
+
+/* And a vector as a point, i.e., a displacement from the origin.  */
+extern at_real_coord vector_to_point(const vector_type);
+
+/* Definitions for these common operations can be found in any decent
+   linear algebra book, and most calculus books.  */
+
+extern gfloat magnitude(const vector_type);
+extern vector_type normalize(const vector_type);
+
+extern vector_type Vadd(const vector_type, const vector_type);
+extern gfloat Vdot(const vector_type, const vector_type);
+extern vector_type Vmult_scalar(const vector_type, const gfloat);
+extern gfloat Vangle(const vector_type in, const vector_type out, at_exception_type * exp);
+
+/* These operations could have been named `P..._vector' just as well as
+   V..._point, so we may as well allow both names.  */
+#define Padd_vector Vadd_point
+extern at_real_coord Vadd_point(const at_real_coord, const vector_type);
+
+#define Psubtract_vector Vsubtract_point
+extern at_real_coord Vsubtract_point(const at_real_coord, const vector_type);
+
+/* This returns the rounded sum.  */
+#define IPadd_vector Vadd_int_point
+extern at_coord Vadd_int_point(const at_coord, const vector_type);
+
+/* Take the absolute value of both components.  */
+extern vector_type Vabs(const vector_type);
+
+/* Operations on points with real coordinates.  It is not orthogonal,
+   but more convenient, to have the subtraction operator return a
+   vector, and the addition operator return a point.  */
+extern vector_type Psubtract(const at_real_coord, const at_real_coord);
+
+/* These are heavily used in spline fitting.  */
+extern at_real_coord Padd(const at_real_coord, const at_real_coord);
+extern at_real_coord Pmult_scalar(const at_real_coord, const gfloat);
+
+/* Similarly, for points with integer coordinates; here, a subtraction
+   operator that does return another point is useful.  */
+extern vector_type IPsubtract(const at_coord, const at_coord);
+extern at_coord IPsubtractP(const at_coord, const at_coord);
+extern at_coord IPadd(const at_coord, const at_coord);
+extern at_coord IPmult_scalar(const at_coord, const int);
+extern at_real_coord IPmult_real(const at_coord, const gfloat);
+extern gboolean IPequal(const at_coord, const at_coord);
+
+#endif /* not VECTOR_H */